Rain-battered Cuddalore is likely to get heavy to very heavy showers, Meteorological department said, adding that today's showers were due to a twin weather system, including formation of a new trough.
The city, meanwhile, is limping back to normalcy with ramped up relief efforts and improved transportation and communication systems.
"A trough of low pressure has formed and lies over South West bay off Tamil Nadu coast," a Met official told PTI.
Also, yesterday's low pressure area over Sri Lanka and adjoining Comorin area off South Tamil Nadu coast has moved westward and now lies over Comorin area and its neighbourhood.
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The city, which has been experiencing intermittent rains, would continue to be cloudy and rain or thundershowers are likely, he added.
As a precautionary measure, the state government has declared holidays for schools and colleges tomorrow in the districts, including Chennai, Kanchipuram and Tiruvallur.
With an improvement in the situation, daytime commercial flights from here began with the first Air India flight to Port Blair taking off this morning.
Medical camps were being held across the city and suburbs.
Apart from medical-checkups, 'Nilavembu Kudineer', a prophylactic herbal neem drink that controls all types of fever associated with body ache, is being given to residents.
As part of the overall efforts to improve supplies of essential commodities, 11 state-run mobile fresh farm outlets began sale of vegetables here.
Chennai Corporation said 24,500 sanitation personnel, including 2,000 personnel from other districts were on the field to clear garbage and tidy up the city.
Allaying the fears of motorists over scarce availability of petrol and diesel, Indian Oil Corporation today said 81 per cent of its outlets were functioning in the city and suburbs with full stocks.
A big chunk of private and public sector banks today functioned to clear the backlog caused by the rains and to ensure hassle-free dispensation of cash at ATMs.
Chief Minister Jayalalithaa, meanwhile, sanctioned
Rs 4 lakh solatium to each member of the next of kin of seven persons, who died in rain-related incidents from December 1-4 in various parts of Tamil Nadu, including Chennai.
Recently, 18 persons died in a private hospital after back up generators were inundated, resulting in snapping of oxygen and ventilator support.
In Cuddalore district, the water level at Veeranam Reservoir, that also supplies drinking water to Chennai touched 44 feet out of its total capacity of 45 feet.
District Collector S Suresh said people living on banks of rivers and canals have been shifted to special camps as water level has been rising in Manimuthar and Pennaiyar rivers.
The state government today said it has constituted 15 monitoring committees to ensure supply of Aavin milk and milk powder to genuine customers and those living in relief camps.
So far, 453 tonnes of milk powder has been distributed to people in relief camps in Chennai, Cuddalore, Tiruvallur and Kancheepuram districts, it said.
Supply of vegetables saw a marked improvement though prices were on the higher side.